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23 terms

PSSA prep - science 8th Gr.

Terms and vocabulary for the 8th grade Science PSSA test
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hypothesis
testable idea
variable
changable factor in an experiment
independant variable
the thing that will be changed in each experiment
dependant variable
the thing that is affected by the change
constant
the thing that is kept the same in each experiment
sample size
the number of observations make when gathering data
control group
the group where there are no variables changed
mean
average of all the numbers in a data set
median
"in the middle" of the data set
mode
"most often" in a data set
phases
the different stages that matter can occur in (solid, liquid, gas, plasma)
physical change
the chemical properties are the same- physical are different
chemical change
the chemical make-up changes
vaporization
liquid to gas change
condensation
gas to liquid change
sublimation
solid changes to gas (it doesn't go to liquid first)
deposition
gas changes to solid (no liquid phase)
melting point
0 Celcius
volume
amount of space an object takes up
mass
the amount of matter that makes up a substance
weight
mass of an object + gravity
solute
the substance that is dissolved
solvent
the substance that does the dissolving